Can be used only html= no, absolute impossible

Is absolute necesary use a web server= no, you can use jscript o vbscript + activex (like ado) for that

For example:

oSrv=new ActiveXObject("adodb.connection");

oSrv.Open( the connection string

oData=oSrv.Execute(

Is a good idea= really no

Is best use a server-side solution like cgi, isapi dll, php, asp, asp.net.

Is a good idea put more information